Across TCGA pan-cancer cohorts, SDF4 mass-spec protein is linked to patient survival in 5 of 34 cancer types, making it a survival-associated SDF4 data layer compared with 20 for mass-spec protein and 6 for mutation status.
The strongest signal is observed in clear cell renal cell carcinoma (CCRCC), where higher SDF4 mass-spec protein is associated with worse overall survival. In most high-consensus cancer types, elevated SDF4 expression acts as an unfavorable survival marker, although some lineages such as PDAC show a favorable association.
CCRCC, LSCC, and HNSC are the cancer types where SDF4 mass-spec protein most reproducibly stratifies survival.